Device for feeding spinning machines with a sliver

ABSTRACT

A device for feeding spinning machines with sliver which includes at least one false twist spiral arranged on a drawing or roving frame between the drawing mechanism and the can in order to insert an additional twist on short sections of the feeding sliver.

United States Patent Inventors Appl. No. Filed Patented Assignee Priority Kazimierz Braun Otwock;

AlelLsander Wojtkowski, Lodz; Wieslaw Bronislaw Sucharzewski, Lodz, all of, Poland Sept. 26, 1968 June 29, 1971 Prudzalnia Bawelny im. Gen. Waltera Lodz, Poland Oct. 7, 1967 Poland DEVICE FOR FEEDING SPINNING MACHINES WITH A SLIVER 5 Claims, 4 Drawing Figs.

US. Cl 57/5l.6, 57/51, 57/77.4

Int. Cl D0lh 5/28 [50] Field of Search; .l 57/51- [56] References Cited UNITED STATES PATENTS 250,043 11/1881 Kelley 57/51.3 2,091,153 8/1937 Martin... 57/5l.3 2,206,242 7/1940 Truslow 57/5 1 3 FOREIGN PATENTS 993,848 6/1965 Great Britain 57/77.4

Primary Examiner-John Petrakes Attorney-Stevens, Davis, Miller & Mosher ABSTRACT: A device for feeding spinning machines with sliver which includes at least one false twist spiral arranged on a drawing or roving frame between the drawing mechanism and the can in order to insert an additional twist on short sections of the feeding sliver.

DEVICE FOR FEEDING SPINNING MACHINES WITH A SLIVER This invention relates to a device for feeding spinning machines, in particular for feeding drawing frames, roving frames and the like, with a sliver made of cotton, wool, manmade staple fibers or of their blends.

In the heretofore known spinning machines, the fiber sliver is drawn out from a can by feeding rollers of a drawing mechanism. In some types of machines, the section of a sliver between the can and the feeding rollers, which section will be called the feeding zone, may achieve the length of several meters. This results in undesired drawing and subsequent breaking of the feeding sliver which is usually of a very small degree of twist and also of small tenacity.

In order to prevent the arising of the above-undesired drafts and breaks of the feeding sliver in the feeding zone, there have been previously proposed feeding devices in the form of rolls, driven rollers or transporting belts as well as false twist devices in the form of a twisting tube or of a rotor. The above-mentioned devices take too much room in the machine and they generally are complicated in design and require an extra power supply to drive them.

There are also known false twist devices, in the form of a spiral, which are applied in the drawing zone of ring spinning frames.

The device according to the invention comprises stationary false twist spirals for inserting a false twist to the feeding sliver in order to strengthen the sliver and to eliminate the disad vantageous drafts.

The means for accomplishing the foregoing objects and other advantages, which will be apparent to those skilled in the art, are set forth in the following specification and claims, and are illustrated in the accompanying drawings dealing with a basic and an alternate embodiment of the present invention. Reference is made now to the drawings in which:

FIG. 1 is a schematic side view of the system embodying the invention;

FIG. 2 is a top plan schematic of the system of FIG. 1;

FIG. 3 is a schematic side view of an alternate embodiment of the present invention; and' FIG. 4 is a somewhat detailed view of an arched false twist spiral according to the present invention.

The feeding device according tothe invention (as shown in FIGS. I and 2) includes sliver cans I, an arched false twist spiral 3 fitted on a crossrod a of a stand 7 and a straight false twist spiral 4 fitted on a casing of the frame, in close proximity to feeding rollers 5 of a drawing mechanism 6. A variation of the device shown in the FIG. 3 includes two straight false twist spirals 4 and two arched false twist spirals 3 fitted on crossrods a, b and c of the stand 7 and on the casing of the frame adjacent the feeding rollers 5.

The false twist spirals 3 are arched with their arches generated by a radius R over an angle a, as shown in FIG. 4. Both the size of the radius R and the angle a depend on the thickness of the worked up sliver 2 and the angle a on the curving of the sliver 2 around the crossrod 7a.

False twist spirals, when applied on the same frame, ought to have the same twist and the same direction of spiral coils.

The device according to the invention operates as follows:

The feeding rollers 5 of the drawing mechanism 6 draw the sliver 2 out from cans I. The sliver 2 moves, via the false twist spirals 3 and 4, to the drawing mechanism 6, i.e., in the feeding zone. The friction which arises between the sliver 2 and the inner surface of the false twist spirals 3 and 4 results in twisting the sliver 2; the number and direction of sliver twists depending on the number and direction of coils in the applied false twist spirals. This additional false twist of the sliver 2 is inserted to the sliver 2 at the section directly adjacent to the rollers. In case of utilizing several false twist spirals for'a single sliver, the feeding sliver receives additional twists along its whole path from the can I to the drawing mechanism 6. Transferring the twists of the sliver through the curvinffpoints on the crossrods 7a and 7c is carried out y the arche alse twist spirals 3.

The false twist device according to the present invention obviates the appearance of undesired drafts and frequent breaks of the feeding sliver, which results in higher efficiency of the drawing frames, roving frames and similar spinning machines.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore to be embraced therein.

We claim:

I. A device for feeding sliver to spinning machines having sliver cans, a stand with at least one crossrod and sliver conveyors transporting sliver from said cans to drawing means, said device comprising at least one straight false twist spiral and at least one arched false twist spiral, each of said spirals having the same pitch and the same direction of spiral, each of said spirals being unmovably mounted in the sliver-feeding zone of said machine.

2. A device according to claim 1 wherein said arched false twist spiral has an arch generated by a radius directly proportional to thickness of the feeding sliver.

3. A device according to claim I wherein said arched false twist spiral has an arch the length of which is determined by an angle a which is directly proportional to the thickness of the feeding sliver.

4. A device according to claim 1 wherein said arched false twist spirals are fixedly mounted at the points where the path of feeding sliver curves.

5. A device according to claim I wherein said straight false twist spirals are fixedly mounted at the inlet to feed rollers of said machine and at straight portions of the path of feeding sliver. 

1. A device for feeding sliver to spinning machines having sliver cans, a stand with at least one crossrod and sliver conveyors transporting sliver from said cans to drawing means, said device comprising at least one straight false twist spiral and at least one arched false twist spiral, each of said spirals having the same pitch and the same direction of spiral, each of said spirals being unmovably mounted in the sliver-feeding zone of said machine.
 2. A device according to claim 1 wherein said arched false twist spiral has an arch generated by a radius directly proportional to thickness of the feeding sliver.
 3. A device according to claim 1 wherein said arched false twist spiral has an arch the length of which is determined by an angle Alpha which is directly proportional to the thickness of the feeding sliver.
 4. A device according to claim 1 wherein said arched false twist spirals are fixedly mounted at the points where the path of feeding sliver curves.
 5. A device according to claim 1 wherein said straight false twist spirals are fixedly mounted at the inlet to feed rollers of said machine and at straight portions of the path of feeding sliver. 